- Sand Gravel & Aggregate, Mendon
- Sandwich Shop Restaurants, Mendon
- Satellite Dish Antennas & Equipment Dealers, Mendon
- Scales Retail, Mendon
- Security Alarm Systems - Home & Business, Mendon
- Security Control Systems & Monitoring, Mendon - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Mendon
- Self Defense Programs, Mendon
- Sheet Metal, Mendon
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Mendon - Sheet Metal Products
- Shopping & Shopping Services, Mendon
- Skateboards & Equipment Shops, Mendon - Skateboarding Supplies
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- Skating Rink & Hockey Operation Services, Mendon
- Social Services & Welfare, Mendon
- Social Workers & Services, Mendon
- Special Events & Party Supply Rental, Mendon
- Specialty Animal Services, Mendon
- Specialty Stores, Mendon
- Sporting Goods Equipment Rental, Mendon
- Sporting Goods Stores, Mendon
- Staffing & Support Services, Mendon
- Stereo, Audio & Video Equipment Dealers & Stores, Mendon
- Store Fixtures & Display Equipment, Mendon
- Surveyor Services, Mendon - Surveying Service
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